JP6023631B2 - Sheet feeding apparatus and image forming apparatus provided with the same - Google Patents

Description

  The present invention relates to a sheet feeding device suitably used for a copying machine, a printer, and the like, and an image forming apparatus including the same.

  2. Description of the Related Art Conventionally, there has been a sheet (document) feeding device that sends a document placed on a supply tray to an image reading unit by a conveying device, and discharges the document that has been read by the image reading unit to a discharge tray positioned below the supply tray. Are known.

  For example, in Patent Document 1, a document guide that is slid according to the width of a document placed on a document placement table and restricts the width direction end of the document, three sensors that detect the slide position of the document guide, An automatic document feeder provided with the above is disclosed. In this automatic document feeder, each sensor detects the size of the document on the document table from the position of the document guide, and the document transported and read from the document table is discharged below the document table. It is like that.

  Further, for example, in Patent Document 2, a sheet feeding tray having a pair of left and right sheet feeding side guide plates slidably opposed to each other in the document width direction and each sheet feeding side guide plate are integrated with each sheet feeding side. An automatic document feeder having a pair of left and right discharge-side guide plates that are slidable in conjunction with a guide plate, and a discharge tray provided below the paper feed tray is disclosed. In this automatic document feeder, a document on a paper feed tray is guided to an image reading unit by a transport unit, and the read-processed document is discharged onto a paper discharge tray.

JP 2007-015776 A JP 2006-027804 A

  By the way, in the automatic document feeder as described in Patent Documents 1 and 2 described above, a plurality of documents are sequentially conveyed to perform a reading process, and the plurality of discharged documents are stacked on a sheet discharge tray. Placed in a state. In such an automatic document feeder, in order to prevent a paper jam or a typographical error that normally occurs when a document that is discharged later collides with a discharged document on the discharge tray, the discharged document is not discharged. It is sent obliquely upward toward the paper tray.

  However, the document discharged obliquely upward collides with the lower surface of the paper feed tray and is not placed at an appropriate position on the paper discharge tray, which may cause a paper jam or misrepresentation near the paper discharge port. There is. For this reason, in the automatic document feeder as described above, a plurality of conveyance ribs that change the discharge direction downward are generally provided in the vicinity of the document discharge port (for example, the lower surface of the paper feed tray). Met. Each of the transport ribs places the document at an appropriate position on the paper discharge tray. Further, each of the transport ribs reduces the contact area with the discharged document surface, and the document is smoothly discharged.

  However, since it is necessary to arrange the transport ribs at appropriate positions corresponding to the size of the document, it is necessary to arrange a plurality of transport ribs in parallel in the width direction of the document in order to be able to handle documents of various sizes. was there. Therefore, when the size of the corresponding document is increased, there is a problem that the number of conveying ribs is increased. In addition, there is a case in which a document of another size is fitted into the side surface of the transport rib installed at a position corresponding to the size of a document and the discharge of the document is obstructed (occurrence of discharge failure).

  The present invention has been made in order to solve the above-described problems, and suppresses an increase in the number of conveying ribs and can smoothly discharge a sheet, and an image forming apparatus including the sheet feeding device. The purpose is to provide.

  In order to achieve the above-described object, a sheet feeding device according to the present invention includes a supply tray on which a sheet is placed, and a discharge tray that feeds the sheet on the supply tray to an image reading unit by a conveying device and receives the sheet after image reading. A feed guide configured to be movable in a direction orthogonal to the sheet feed direction, and restricting a position in the width direction of the sheet on the feed tray, and movement of the feed guide And a transport rib for guiding the discharged sheet onto a discharge tray.

  According to this configuration, when the supply guide is moved in accordance with the width of the sheet placed on the supply tray, the transport rib is simultaneously moved. That is, the conveyance rib is adjusted to a position corresponding to the size of the sheet set on the supply tray in synchronization with the movement of the supply guide. Thereby, if it is a sheet which can be supplied, a conveyance rib can be made to face in an appropriate position irrespective of the size. Therefore, it is possible to prevent an increase in the number of conveying ribs that accompanies an increase in the size of the corresponding sheet. Further, since the conveying rib is always adjusted to an optimum position for the size of the sheet, it is possible to prevent occurrence of a sheet discharge failure that may occur when a large number of conveying ribs are provided for each size.

  In this case, it is preferable to include a discharge guide that is configured to be movable together with the transport rib in conjunction with the movement of the supply guide and regulates the position in the width direction of the discharged sheet.

  According to this configuration, by setting the distance in the width direction of the supply guide (hereinafter referred to as “guide width”), the guide width of the discharge guide is also set at the same time, and the discharged sheets are aligned in the width direction. Placed on the discharge tray. As a result, the discharged sheets can be stocked in an orderly manner with a simple operation. In addition, since the discharge guide and the transport rib move integrally, for example, the problem that may occur when the transport rib is fixedly provided that the moving discharge guide interferes with the fixed transport rib is reliably prevented. be able to.

  In this case, a pair of the supply guide and the conveyance rib are arranged so as to face each other in the sheet width direction, and one of the supply guide and the conveyance rib and the other of the supply guide and the conveyance rib It is preferable to include an interlocking connection mechanism that is provided between the pair of supply guides and the transport ribs so that the pair of supply guides and the transport ribs are moved in an even manner from the center in the width direction of the sheet.

  According to this configuration, when one (or the other) supply guide is moved, the other (or one) supply guide is also moved in synchronization via the interlocking connection mechanism. Thereby, since the position adjustment of each supply guide and each conveyance rib can be performed by one operation, the operativity concerning the said adjustment can be improved. Further, since the supply guides and the transport ribs are equally distributed with reference to the center in the width direction of the sheet, the above adjustment can be performed with a small amount of movement.

  In order to achieve the above object, an image forming apparatus according to the present invention includes any one of the sheet feeding apparatuses described above.

  According to this configuration, the position of the transport rib is adjusted to a position corresponding to the size of the sheet set on the supply tray in synchronization with the movement of the supply guide. Thereby, if it is a sheet which can be supplied, a conveyance rib can be made to face in an appropriate position irrespective of the size, Therefore The increase in the number of installation of a conveyance rib can be prevented. Further, since the conveying rib is always adjusted to a position optimal for the size of the sheet, it is possible to smoothly discharge the sheet.

  According to the present invention, it is possible to suppress an increase in the number of conveying ribs accompanying an increase in the size of the corresponding sheet, and it is possible to smoothly discharge the sheet.

1 is an external perspective view showing an image forming apparatus according to an embodiment of the present invention. 1 is a cross-sectional view schematically showing an internal structure of an image forming apparatus according to an embodiment of the present invention. 1 is a perspective view of a document feeder according to an embodiment of the present invention. 1 is a side sectional view of a document feeder according to an embodiment of the present invention. It is a lower side perspective view of the supply tray which concerns on one Embodiment of this invention. FIG. 4 is a right side view of the document conveyance guide according to the embodiment of the present invention. FIG. 6 is a bottom view of the document conveyance guide according to the embodiment of the present invention. FIG. 6 is a cross-sectional view illustrating a state where a guide width of the document conveyance guide according to the embodiment of the present invention is widened. FIG. 6 is a cross-sectional view illustrating a state where the guide width of the document conveyance guide according to the embodiment of the present invention is narrowed.

  Hereinafter, an image forming apparatus including a document feeding device as a sheet feeding device according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. In the following description, for the sake of convenience, each direction is defined as indicated by an arrow in each figure.

  First, the image forming apparatus 1 will be described with reference to FIGS. 1 and 2. Here, FIG. 1 is an external perspective view showing the image forming apparatus 1, and FIG. 2 is a cross-sectional view schematically showing the internal structure of the image forming apparatus 1.

  The image forming apparatus 1 is configured by housing a printer unit 3 and a scanner unit 4 as an image reading unit in a box-shaped apparatus main body 2. In addition, a document feeding device 5 that automatically feeds the document P1 one by one to the image reading position H of the scanner unit 4 is provided on the upper portion of the apparatus main body 2.

  The printer unit 3 performs monochrome image forming processing based on image data transmitted from, for example, a personal computer (not shown) or the scanner unit 4, and includes a paper storage unit 6 that stores the paper P2, and a paper An image forming unit 8 that transfers a toner image onto the paper P2 supplied from the storage unit 6 to the conveyance path 7, a fixing device 9 that fixes the transferred toner image on the paper P2, and a discharge destination of the paper P2 after fixing. A paper discharge unit 10. Note that the original P1 and the paper P2 as sheets are not limited to paper, and a recording material such as a resin film or an OHP sheet may be used.

  The image forming unit 8 includes a toner container 11 that stores toner for replenishment (black), a photosensitive drum 12 that carries a toner image, a charger 13 that sets the surface of the photosensitive drum 12 to a predetermined voltage, and a photosensitive member. An exposure device 14 that emits a light beam to the surface of the drum 12 to form a predetermined electrostatic latent image, a developing device 15 that develops the electrostatic latent image into a toner image with toner, and a toner image on the photosensitive drum 12 The image forming apparatus includes a transfer roller 16 for transferring to the paper P2 and a cleaning device 17 for removing toner remaining on the surface of the photosensitive drum 12 after transfer.

  The scanner unit 4 includes a contact glass 20 and a platen glass 21 fixed to the upper part of the apparatus main body 2, an optical scanning unit 22 provided so as to be able to read a document P 1 on each glass 20, 21, and an optical scanning unit 22 A reflection unit 23 that reflects light and a CCD 25 to which light reflected by the reflection unit 23 is input via a condenser lens 24 are configured. The condenser lens 24 and the CCD 25 are disposed in a fixed state.

  The optical scanning unit 22 includes a light source 26 that emits light toward the document P1 and a reflection unit 27 that directs the light reflected by the document P1 toward the reflection unit 23. The light emitted from the light source 26 and reflected by the document P1 is input to the CCD 25, whereby the image on the document P1 is converted into an electrical signal.

  The optical scanning unit 22 is configured to be able to read a document P1 (image thereof) passing through the contact glass 20 by the document feeder 5 while being fixed at the image reading position H. Further, the optical scanning unit 22 can scan the original P1 (image thereof) placed on the platen glass 21 by scanning from the image reading position H to the right in FIG. At this time, the reflection unit 23 moves in the same direction as the optical scanning unit 22 so that the optical path length from the document P1 to the condenser lens 24 is always constant. At this time, the movement amount of the reflection unit 23 is ½ of the movement amount of the optical scanning unit 22.

  The image of the original P1 on each glass 20, 21 is read by the optical scanning unit 22 (scanner unit 4), and the photoelectrically converted image data is output from the scanner unit 4 to the printer unit 3, and the printer unit 3 performs image forming processing. Is executed.

  Here, an image forming process performed by the image forming apparatus 1 will be briefly described. When image data is input from the scanner unit 4 or the like, the photosensitive drum 12 whose surface is charged by the charger 13 is exposed by the exposure device 14 to form an electrostatic latent image corresponding to the image data. . The electrostatic latent image is developed into a toner image by the developing device 15 and a transfer bias is applied to the transfer roller 16, whereby the toner image is transferred to the paper P <b> 2 transported from the paper storage unit 6 through the transport path 7. Is done. The toner image is fixed on the paper P2 by the fixing device 9, and the paper P2 on which the toner image is fixed is conveyed and discharged to the paper discharge unit 10. The toner remaining on the surface of the photosensitive drum 12 after the transfer is removed by the cleaning device 17.

  Next, the document feeder 5 will be described in detail with reference to FIGS. FIG. 3 is a perspective view of the document feeder 5, and FIG. 4 is a side sectional view of the document feeder 5. FIG. 5 is a lower perspective view of the supply tray. 6 is a right side view of the document conveyance guide, and FIG. 7 is a bottom view of the document conveyance guide. FIG. 8 is a cross-sectional view showing a state where the guide width of the document transport guide is widened, and FIG. 9 is a cross-sectional view showing a state where the guide width is narrowed. In the following description, the front-rear direction of the image forming apparatus 1 is also referred to as the “width direction” of the original P1, and the left-right direction of the image forming apparatus 1 is also referred to as the “conveying direction” or “discharge direction” of the original P1.

  The document feeder 5 is a so-called ADF (Auto Document Feeler), and is attached so as to be rotatable about one side of the upper back side of the scanner unit 4. By rotating the front side of the document feeder 5 so as to be lifted upward, the upper surfaces of the contact glass 20 and the platen glass 21 are exposed.

  As shown in FIGS. 2 to 4, the document feeder 5 includes a substantially box-shaped cover frame 30, a supply tray 31 on which the document P <b> 1 is placed, and a transport device that feeds the document P <b> 1 on the supply tray 31 to the scanner unit 4. 32 and a discharge tray 33 for receiving the original P1 after reading the image discharged by the conveying device 32.

  The cover frame 30 is made of a resin material, and the right side surface of the cover frame 30 is inclined upward toward the downstream side in the transport direction. A side opening 30 a is formed on the right side surface of the cover frame 30, and a lower surface opening 30 b (see FIG. 4) facing the contact glass 20 is formed on the lower surface of the cover frame 30.

  As shown in FIGS. 3 to 5, the supply tray 31 includes a saucer-shaped document setting table 34 extending to the right of the cover frame 30, and the width direction of the document setting table 34 (perpendicular to the feeding direction of the document P <b> 1). A pair of document conveyance guides 35 configured to be movable in a direction in which the pair of document conveyance guides 35 are moved in conjunction with each other. In the present embodiment, the document setting table 34, each document conveyance guide 35, the interlocking connection mechanism 36, and the like are formed of a resin material.

  The document setting table 34 is provided so as to be inclined slightly toward the cover frame 30 and is formed so that the right side on the front side is largely cut rearward in plan view (see FIG. 1). A plurality of documents P1 are placed on the document setting table 34, and each document P1 is conveyed from right to left. Further, the left end portion of the document setting table 34 is inserted into the cover frame 30 through the side opening 30a, and a pair of rotating support shafts 34a (see FIG. 5) protruding from both outer surfaces in the width direction of the document setting table 34 are covered with the cover frame. It is pivotally supported on both inner walls of 30. Thus, the document setting table 34 is rotated upward about each rotation support shaft 34a.

  A pair of front and rear slits 34b extending in the width direction is formed through the document setting table 34. The pair of slits 34 b are juxtaposed in the width direction on the downstream side in the conveyance direction of the document setting table 34 (near the cover frame 30). A plurality of reinforcing ribs 34c for securing rigidity are provided on the lower surface of the document setting table 34 in the front, rear, left and right directions.

  Although details will be described later, each document conveyance guide 35 is slidably provided in each slit 34b, and a pair of document conveyance guides 35 are moved in conjunction with each other by an interlocking connection mechanism 36.

  As shown in FIG. 4, the conveyance device 32 includes a plurality of rollers and the like that are rotatably disposed along the document conveyance path 40 formed inside the cover frame 30. Specifically, the conveyance device 32 includes a pickup roller 41 provided in the vicinity of the side opening 30a, a supply roller 42 provided downstream thereof, a conveyance roller 43 provided obliquely below the supply roller 42, and a conveyance roller. And a pair of discharge rollers 45 provided in the vicinity of the discharge port 30c opened below the side surface opening 30a.

  The document conveyance path 40 is folded and formed in a U shape so as to allow the side opening 30a and the discharge port 30c to communicate with each other (see the broken line arrow in FIG. 4).

  The pickup roller 41 is connected to the supply roller 42 via a connecting gear 41a, and rotates up and down around the rotation axis of the supply roller 42. The pickup roller 41 rotates from the upper standby position to the lower paper feed position, so that the originals P1 on the supply tray 31 are sent out one by one.

  A nip member 47 urged by a coil spring 46 is provided below the supply roller 42. The document P1 delivered from the pickup roller 41 passes between the supply roller 42 and the nip member 47 and is transported to the downstream side of the document transport path 40.

  The document P1 sent by the supply roller 42 passes between the transport roller 43 and the driven roller 44 and is transported onto the contact glass 20 disposed below the transport roller 43.

  A pressing member 49 urged by a coil spring 48 is provided on the upper side of the contact glass 20 so as to protrude downward from the lower surface opening 30b, and a pressing force is applied to the document P1 on the contact glass 20. Therefore, the conveyed document P1 is further conveyed downstream of the document conveyance path 40 while being pressed lightly against the contact glass 20 by the pressing member 49. The image information on the document P1 is read by the optical scanning unit 22 when passing between the contact glass 20 and the pressing member 49.

  The document P1 from which the image information has been read is discharged from the discharge port 30c onto the discharge tray 33 by the rotation of the pair of discharge rollers 45.

  The discharge tray 33 is made of a resin material and extends to the right of the discharge port 30 c of the cover frame 30. The discharge tray 33 is formed in a tray shape so as to be able to receive the discharged document P1 below the supply tray 31, and the surface for receiving the document P1 is formed substantially parallel to the document setting table 34 of the supply tray 31. Has been. Further, a projecting portion 33a inclined upward toward the downstream side is provided at the center in the width direction on the downstream side in the discharge direction of the discharge tray 33.

  Incidentally, the downstream end portion of the document conveyance path 40 is formed to be inclined upward toward the discharge tray 33 (see FIG. 4). Therefore, the document P1 is sent out on the discharge tray 33 obliquely upward from the discharge port 30c. This prevents the original P1 discharged later from colliding with the discharged original P1 stacked on the discharge tray 33.

  Next, with reference to FIGS. 3 to 9, each document transport guide 35 and the interlocking connection mechanism 36 of the supply tray 31 will be described in detail.

  Each document conveyance guide 35 includes a supply guide 50 that regulates the position in the width direction of the document P1 placed on the document setting table 34, a discharge guide 51 that regulates the position in the width direction of the discharged document P1, and And two transport ribs 52 for guiding the discharged document P1 onto the discharge tray 33. Since the pair of front and rear document transport guides 35 have substantially the same structure, the front document transport guide 35 will be mainly described below.

  As shown in FIGS. 6 and 7, the supply guide 50 includes a supply side support plate 53 provided parallel to the upper surface of the document setting table 34, and a supply side provided extending upward from the front end of the supply side support plate 53. And a cursor 54.

  The supply side support plate 53 is formed in a substantially rectangular plate shape in plan view. The supply-side cursor 54 is formed in a substantially trapezoidal plate shape in a side view (see FIGS. 3 and 4), and a document pressing portion 55 is directed inward in the width direction at the upper end on the downstream side of the supply-side cursor 54. It is extended and provided.

  The upstream side (right side) of the document pressing portion 55 is inclined downward toward the downstream side, and the downstream side (left side) of the document pressing portion 55 is formed substantially parallel to the supply side support plate 53 (see FIG. 3 and FIG. 4). That is, the document pressing portion 55 is integrally formed by bending so as to protrude downward in a side view.

  As shown in FIGS. 5 to 7, the discharge guide 51 includes a discharge side support plate 56 provided parallel to the lower surface of the document setting table 34, and a discharge side provided extending downward from the front end of the discharge side support plate 56. And a cursor 57.

  The discharge side support plate 56 is formed in a substantially rectangular plate shape in plan view. The discharge-side cursor 57 is formed in a substantially rectangular plate shape in a side view, and is formed by bending the discharge port 30c (upstream in the discharge direction) toward the outer side in the width direction. That is, the guide width in the front-rear direction formed by the pair of discharge guides 51 is configured to be wide on the discharge port 30c side and narrow on the downstream side in the discharge direction.

  As shown in FIGS. 5, 6, 8, and 9, the supply guide 50 and the discharge guide 51 are coupled together by a coupling portion 58. Specifically, the upper end of the connecting portion 58 is connected to the right side (upstream in the transport direction) of the supply side support plate 53, and the lower end of the connecting portion 58 is connected to the right end portion (downstream end in the discharge direction) of the discharge side support plate 56. It is connected. Thereby, the supply guide 50 and the discharge guide 51 are integrally formed so as to be parallel to each other with the document setting table 34 interposed therebetween.

  The connecting portion 58 is slidably engaged with the slit 34b described above. Specifically, the connecting portion 58 is slit 34b in a state where the lower surface of the supply side support plate 53 is in sliding contact with the upper surface of the document setting table 34 and the upper surface of the discharge side support plate 56 is in sliding contact with the lower surface of the document setting table 34. Is engaged. As a result, the supply guide 50 and the discharge guide 51 that are integrally formed via the connecting portion 58 move in the width direction while being guided by the slit 34b in conjunction with each other.

  As shown in FIGS. 5 to 9, the two transport ribs 52 project downward from the lower surface of the discharge side support plate 56. Specifically, each conveyance rib 52 extends downstream from the discharge port 30c side end portion in the discharge direction at a position near the rear end portion of the discharge side support plate 56 and the discharge side cursor 57. Each transport rib 52 is inclined downward toward the downstream in the discharge direction, and is formed in a substantially trapezoidal shape in a side view.

  As shown in FIGS. 5, 8, and 9, five fixing ribs 59 project at equal intervals in the width direction in the range in the center in the width direction of the lower surface of the document setting table 34. Each fixing rib 59 is provided so as to be aligned with each conveyance rib 52 in the width direction. The fixing ribs 59 except for the fixing rib 59 at the center in the width direction have substantially the same shape as the conveying ribs 52. The fixing rib 59 at the center is slightly larger than the other fixing ribs 59 and has a side surface. It is formed in a substantially triangular shape as viewed. Each fixing rib 59 is provided at a position where the fixing rib 59 can be slidably contacted with the document P1 having the minimum width. That is, each fixing rib 59 is disposed inside the document P1 having the minimum width to be conveyed.

  Next, as shown in FIGS. 4 to 9, the interlocking connection mechanism 36 is formed integrally with each discharge-side support plate 56, and includes a pair of front and rear rack portions 60 that extend inward in the width direction, and a pair of racks. And pinion gears 61 that mesh with the portions 60, respectively.

  As shown in FIG. 5, the rack portion 60 of the front document transport guide 35 extends rearward from the inner corner on the downstream side (right side) of the discharge side support plate 56 in the discharge direction, and the rear document transport guide 35. The rack portion 60 extends forward from the substantially center of the discharge side support plate 56 in the discharge direction.

  Each rack portion 60 is formed in parallel with the lower surface of the document setting table 34 and at the same height with a predetermined interval in the discharge direction so as not to contact each other. Teeth 62 are formed on the opposing end surfaces of the rack portions 60, and four protrusions 63 are arranged in parallel on the end surfaces facing the teeth 62 (see FIGS. 6 and 7). Each protrusion 63 is in sliding contact with the reinforcing rib 34c extending in the width direction.

  In addition, spring openings 64 are formed in the vicinity of the two protrusions 63 near the center in the width direction of each rack 60 (see FIGS. 6 and 7). Each protrusion 63 in which the spring opening 64 is formed is configured to move elastically in the discharge direction.

  As shown in FIGS. 4, 5, 8, and 9, the pinion gear 61 is a gear that protrudes downward from the lower surface of the document setting table 34 on the downstream side (right side) in the discharge direction of the fixing rib 59 at the center in the width direction. The shaft 61a is rotatably supported. The pinion gear 61 includes a gear main body 61b having a plurality of tooth portions (not shown) formed on the peripheral surface, and a flange portion 61c integrally formed on the lower surface of the gear main body 61b.

  The gear body 61b meshes with the rack portion 60 on the rear side from the upstream side in the discharge direction, and meshes with the rack portion 60 on the front side from the downstream side in the discharge direction. That is, the gear main body 61 b is disposed so as to be sandwiched between the pair of rack portions 60.

  The flange portion 61c is formed to have a larger diameter than the gear main body 61b and is formed on the same axis as the gear main body 61b. The lower surface of each rack portion 60 on the tooth portion 62 side is in sliding contact with the upper surface of the flange portion 61c.

  Next, with reference to FIGS. 8 and 9, the operation of the document feeder 5 configured as described above will be described. Here, as an example, a case will be described in which the guide width is reduced (see FIG. 9) from a state where the guide width of the pair of document conveyance guides 35 is wide (see FIG. 8).

  The user places a document P1 (or a bundle of documents P1) to be read by the scanner unit 4 on the document setting table 34 (see a two-dot chain line in FIG. 8). At this time, since the document pressing portion 55 of each supply guide 50 becomes higher toward the upstream side, the user can easily set the document P1 from the upstream side in the transport direction to the downstream side. Further, since the height with respect to the document setting table 34 is constant on the downstream side of the document pressing portion 55, the number of documents P1 that can be set is restricted. Accordingly, it is possible to prevent document conveyance failure that may occur when the document (bundle) is set exceeding the settable number of sheets.

  Next, the user holds one of the pair of front and rear supply guides 50 and moves it in the width direction so that each supply-side cursor 54 comes into contact with both ends of the document P1 in the width direction (see FIG. 9).

  At this time, since the rack portion 60 integrally formed with one supply guide 50 also moves, the pinion gear 61 that meshes with the rack portion 60 rotates in the moving direction of the rack portion 60. Since the rotation of the pinion gear 61 is also transmitted to the other rack portion 60, the other supply guide 50 moves by the same distance in synchronization with the movement of the one supply guide 50. Thus, the pair of front and rear supply guides 50 are evenly moved from the center in the width direction of the document P1 in the direction in which the guide width decreases. That is, the interlocking connection mechanism 36 moves the pair of front and rear supply guides 50 by so-called center distribution. As a result, the document P1 is brought to the center in the width direction, and both ends thereof are guided to the supply side cursors 54.

  Further, since the supply guide 50 is formed integrally with each discharge guide 51 and each conveyance rib 52 via the connecting portion 58, the pair of front and rear discharge guides 51 and the plurality of conveyance ribs 52 are also so-called center distribution. Move in the direction of decreasing guide width. Thereby, the guide widths of the pair of supply guides 50 and the pair of discharge guides 51 are simultaneously adjusted in conjunction with each other. At the same time, each transport rib 52 is adjusted to a position corresponding to the size of the document P1.

  The pair of document conveyance guides 35 is guided by the slits 34 b and slides in the width direction, so that the length of each slit 34 b is within the movable range of each document conveyance guide 35. In addition, the protrusions 63 of the rack portions 60 are in sliding contact with the reinforcing ribs 34c, and the lower surfaces of the tooth portions 62 of the rack portions 60 are in sliding contact with the upper surfaces of the flange portions 61c. Directional movement is guided. Further, each protrusion 63 formed with the spring opening 64 is in sliding contact with the reinforcing rib 34c extending in the width direction, so that an appropriate load is applied to the movement of each rack 60. As a result, the adjusted position of the document conveyance guide 35 is appropriately held.

  Next, the original P1 set on the original setting table 34 is sent out one by one to the original conveying path 40 by the conveying device 32, the image information is read by the optical scanning unit 22, and is discharged from the discharge port 30c.

  As described above, since the document transport path 40 is inclined upward toward the downstream in the discharge direction, the document P1 is discharged onto the discharge tray 33 obliquely upward from the discharge port 30c. The discharged document P1 is guided by a pair of front and rear discharge guides 51 and comes into contact with the transport ribs 52 and the fixed ribs 59, whereby the discharge direction is changed obliquely downward. The original P1 discharged while being in sliding contact with the respective transport ribs 52 and the respective fixed ribs 59 is placed at an appropriate position on the paper discharge tray 33.

  As described above, since the pair of discharge guides 51 are formed so that the guide width is wide on the discharge port 30c side, for example, even when the document P1 is discharged in the width direction, the document P1. Can be appropriately guided to the pair of discharge guides 51. Thereby, it is possible to prevent document discharge failure.

  The same applies to the case where the guide width of the pair of document conveying guides 35 is increased. Further, the user may operate both document transport guides 35 with both hands at the same time.

  According to the image forming apparatus 1 according to the present embodiment described above, when each supply guide 50 (supply side cursor 54) is moved in accordance with the width of the document P1 placed on the supply tray 31, each conveyance rib is simultaneously performed. 52 moves. That is, each conveyance rib 52 is adjusted to a position corresponding to the size of the document P1 set on the supply tray 31 in synchronization with the movement of the supply guide 50. As a result, if the document can be supplied, the transport ribs 52 can face each other regardless of the size. Therefore, it is possible to prevent an increase in the number of installed conveying ribs 52 due to an increase in the size of the corresponding document. Further, since each transport rib 52 is always adjusted to the optimum position for the size of the document P1, it is possible to prevent the occurrence of document discharge failure that may occur when a large number of transport ribs 52 are provided for each size. .

  Further, according to the image forming apparatus 1 according to the present embodiment, by setting the guide width of the pair of supply guides 50, the guide width of the pair of discharge guides 51 is also set at the same time. It is placed on the discharge tray 33 in a state aligned in the direction. As a result, the discharged document P1 can be stocked in an orderly manner with a simple operation. Further, since the discharge guide 51 and each transport rib 52 move integrally, for example, the discharge guide 51 that moves may interfere with the fixed transport rib 52 and may occur when the transport rib 52 is fixedly provided. Problems can be prevented reliably.

  Furthermore, according to the image forming apparatus 1 according to the present embodiment, when one (or the other) supply guide 50 is moved, the other (or one) supply guide 50 is also synchronized via the interlocking connection mechanism 36. Moving. Thereby, since the position adjustment of each supply guide 50, each discharge guide 51, and each conveyance rib 52 (each document conveyance guide 35) can be performed by a single operation, the operability of the adjustment can be improved. . Further, since each document transport guide 35 is equally distributed with reference to the center in the width direction of the document P1, the above adjustment can be performed with a small amount of movement.

  Note that the interlocking connection mechanism 36 may be omitted, and the pair of front and rear document transport guides 35 may be configured to be independently movable. In this case, the guide width can be adjusted so as to sandwich the document P1 set at an arbitrary position in the width direction on the document setting table 34 (supply tray), and the position of the transport rib can also be adjusted.

  Note that the interlocking connection mechanism 36 may be omitted, one of the document conveyance guides 35 may be fixed, and only the other document conveyance guide 35 may be slidable.

  Note that the discharge side cursor 57 of each discharge guide 51 may be omitted.

  In the present embodiment, the guide width of the pair of supply-side cursors 54 and the guide width of the pair of discharge-side cursors 57 on the downstream side in the discharge direction are the same width. That is, each supply-side cursor 54 and each discharge-side cursor 57 are arranged so as to be at the same position in the width direction, but each discharge-side cursor 57 is placed on the outer side in the front-rear direction than each supply-side cursor 54. It may be arranged. Thereby, the discharged document P1 is appropriately guided between the pair of discharge-side cursors 57 (within the guide width). In this case, since the document P1 slightly moves in the width direction (front-rear direction), it is preferable that each conveyance rib 52 is disposed at a position where it does not catch on the end of the document P1 in the width direction.

  The above description of the embodiment of the present invention describes a preferred embodiment of the image forming apparatus 1 according to the present invention, and may have various technically preferable limitations. The technical scope of the present invention is not limited to these embodiments unless specifically described to limit the present invention. Furthermore, the constituent elements in the embodiments of the present invention described above can be appropriately replaced with existing constituent elements, and various variations including combinations with other existing constituent elements are possible. The description of the embodiment of the present invention is not intended to limit the content of the invention described in the claims.

1 Image forming apparatus 4 Scanner unit (image reading unit)
5 Document feeder (sheet feeder)
31 Supply tray 32 Conveying device 33 Discharge tray 36 Interlocking coupling mechanism 50 Supply guide 51 Discharge guide 52 Conveying rib P1 Document

Claims (4)

A supply tray for placing the sheets, sending the image reading portion by the conveying apparatus the sheet on the feed tray, a sheet feeding device provided with a discharge tray for receiving said sheet after the image reading, a,
It is movable in the direction perpendicular to the feeding direction of the sheet, a feeding guide for regulating the widthwise position of the sheet on the feed tray,
Wherein in conjunction with the movement of the supply guide is movable, and the conveying ribs guiding the sheet onto the discharge tray to be discharged,
A plurality of fixing ribs provided so as to be arranged in the width direction of the conveyance rib and the sheet, and provided at positions where the sheet can be slidably contacted with the minimum width of the conveyance;
A discharge guide configured to be movable together with the transport rib in conjunction with the movement of the supply guide, and regulating a position in the width direction of the discharged sheet ,
A pair of the supply guide and the discharge guide are arranged so as to face each other in the width direction of the sheet,
Guide width formed by the pair of discharge guides, sheet feeding apparatus according to claim that you have constructed wider than the guide width formed by the pair of feed guides.   The sheet feeding apparatus according to claim 1, wherein the fixed rib at the center in the width direction of the sheet is formed larger than the other fixed ribs. It said supply guide and the conveying ribs are each a pair arranged so as to face in the width direction of the sheet,
And one of said supply guide and the conveying ribs provided between the other of said supply guide and the conveyance ribs, said pair of feed guides and the transport ribs, in conjunction with one another, equally the widthwise center of the sheet The sheet feeding apparatus according to claim 1, further comprising an interlocking connection mechanism that moves the sheet to a position.   An image forming apparatus comprising the sheet feeding device according to claim 1.

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